Home > Publications > Elimination of Germinal-Center-Derived Self-Reactive B Cells Is Governed by the Location and Concentration of Self-Antigen.
Centenary Institute - Medical Research
Centenary Institute - Medical Research

Elimination of Germinal-Center-Derived Self-Reactive B Cells Is Governed by the Location and Concentration of Self-Antigen.

Secondary diversification of the B cell repertoire by immunoglobulin gene somatic hypermutation in the germinal center (GC) is essential for providing the high-affinity antibody specificities required for long-term humoral immunity. While the risk to self-tolerance posed by inadvertent generation of self-reactive GC B cells has long been recognized, it has not previously been possible to identify such cells and study their fate. In the current study, self-reactive B cells generated de novo in the GC failed to survive when their target self-antigen was either expressed ubiquitously or specifically in cells proximal to the GC microenvironment. By contrast, GC B cells that recognized rare or tissue-specific self-antigens were not eliminated, and could instead undergo positive selection by cross-reactive foreign antigen and produce plasma cells secreting high-affinity autoantibodies. These findings demonstrate the incomplete nature of GC self-tolerance and may explain the frequent association of cross-reactive, organ-specific autoantibodies with postinfectious autoimmune disease.

Chan, T., Wood, K., Hermes, J., Butt, D., Jolly, C., Basten, A., Brink, R.

Immunity, 37(5), 893-904. 

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